1.2dev: Remove duplicate `GenericResourceManager` class
1.2dev: Remove duplicate `GenericResourceManager` class

The duplication was a result of incorrect merging.

Refs #12369.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@14583 af82e41b-90c4-0310-8c96-b1721e28e2e2

walty8/trac,walty8/trac,walty8/trac,walty8/trac